Accession Number : ADA322925
Title : North American Breeding Bird Survey Annual Summary, 1989.
Descriptive Note : Biological rept.,
Corporate Author : FISH AND WILDLIFE SERVICE LAUREL MD OFFICE OF MIGRATORY BIRD MANAGEMENT
Personal Author(s) : Droege, Sam ; Sauer, John R.
PDF Url : ADA322925
Report Date : AUG 1990
Pagination or Media Count : 29
Abstract : The North American Breeding Bird Survey (BBS) is run by approximately 2,000 skilled amateur ornithologists and is coordinated cooperatively by the U.S. Fish and Wildlife Service and the Canadian Wildlife Service. Since 1966. BBS cooperators have been collecting standardized information on North American bird populations. The BBS is a roadside survey, comprised of permanent routes that are surveyed yearly. Each route is 39.4 km (24.5 miles) long and consists of 50 stops spaced 0.8 km (0.5 mile) apart. All birds heard or seen during a 3-min observation period at each stop are recorded, and, for each species, the sum of the counts on individual stops is used as an index of species density on the route. Survey routes occur throughout the continental United States and most of Canada (see map in Droege and Sauer 1989). Here, we present the population changes of the 251 bird species reported on the 50 or more BBS routes in the survey region during 1988 and 1989. Population trends for 1966-89 are presented for comparison. The direction and significance of population changes between the years for the 306 species occurring on 10 or more routes within States arid Provinces are summarized in Appendix B. The pattern of population changes for selected species is graphically summarized on maps by physiographic stratum (Droege and Saner 1959). Detailed State, provincial, and physiographic strata changes are available to interested readers.
Descriptors : *BIRDS, *BREEDING, DENSITY, UNITED STATES, CANADA, POPULATION, REGIONS, SURVEYS, PATTERNS, ROUTING, INDEXES, WILDLIFE, NORTH AMERICA.
Subject Categories : Biology
Distribution Statement : APPROVED FOR PUBLIC RELEASE